mirror of
https://github.com/DesignPatternsPHP/DesignPatternsPHP.git
synced 2025-02-21 08:02:34 +01:00
62 lines
1.7 KiB
ReStructuredText
62 lines
1.7 KiB
ReStructuredText
`Pool`__
|
||
========
|
||
|
||
Purpose
|
||
-------
|
||
|
||
The **object pool pattern** is a software creational design pattern that
|
||
uses a set of initialized objects kept ready to use – a "pool" – rather
|
||
than allocating and destroying them on demand. A client of the pool will
|
||
request an object from the pool and perform operations on the returned
|
||
object. When the client has finished, it returns the object, which is a
|
||
specific type of factory object, to the pool rather than destroying it.
|
||
|
||
Object pooling can offer a significant performance boost in situations
|
||
where the cost of initializing a class instance is high, the rate of
|
||
instantiation of a class is high, and the number of instances in use at
|
||
any one time is low. The pooled object is obtained in predictable time
|
||
when creation of the new objects (especially over network) may take
|
||
variable time.
|
||
|
||
However these benefits are mostly true for objects that are expensive
|
||
with respect to time, such as database connections, socket connections,
|
||
threads and large graphic objects like fonts or bitmaps. In certain
|
||
situations, simple object pooling (that hold no external resources, but
|
||
only occupy memory) may not be efficient and could decrease performance.
|
||
|
||
UML Diagram
|
||
-----------
|
||
|
||
.. image:: uml/uml.png
|
||
:alt: Alt Pool UML Diagram
|
||
:align: center
|
||
|
||
Code
|
||
----
|
||
|
||
You can also find this code on `GitHub`_
|
||
|
||
WorkerPool.php
|
||
|
||
.. literalinclude:: WorkerPool.php
|
||
:language: php
|
||
:linenos:
|
||
|
||
StringReverseWorker.php
|
||
|
||
.. literalinclude:: StringReverseWorker.php
|
||
:language: php
|
||
:linenos:
|
||
|
||
Test
|
||
----
|
||
|
||
Tests/PoolTest.php
|
||
|
||
.. literalinclude:: Tests/PoolTest.php
|
||
:language: php
|
||
:linenos:
|
||
|
||
.. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/main/Creational/Pool
|
||
.. __: http://en.wikipedia.org/wiki/Object_pool_pattern
|